Table 3.

Possible presentation of study without a preexisting exposure based comparison (cohort study requiring a reanalysis)

Patient	Exposure	Outcome
Patient 1	Yes (e.g. treated)	Yes (e.g. died)
Patient 2	No (e.g. not treated)	No (e.g. alive)
.	.	.
.	.	.
.	.	.
Patient 20	Yes (e.g. treated)	Yes (e.g. alive)